title: Occurrence of the PsbS and LhcSR products in the green alga Ulva linza and their correlation with excitation pressure.
abstract: To avoid photoinhibition, plants have developed diverse photoprotection mechanisms. One of the short-term high light protection mechanisms in plants is non-photochemical quenching (NPQ), which dissipates the absorbed light energy as thermal energy. In the green alga, Ulva linza, the kinetics of NPQ starts with an initial, quick rise followed by a decline, and then a second and higher rise at longer time periods. During the whole phase, NPQ is triggered and controlled by ΔpH, then strengthened and modulated by zeaxanthin. Light-harvesting complex (LHC) family members are known to play crucial roles in this mechanism. The PSBS protein, a member of the LHC family that was thought to be present exclusively in higher plants, has been identified for the first time in U. linza. The expression of both PSBS and LHCSR was up-regulated during high light conditions, and LHCSR increased more than PSBS. Both LHCSR and PSBS-dependent NPQ may be important strategies for adapting to the environment, and they have undoubtedly played a role in their evolution.
authors.affiliation: Yellow Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Nanjing Road 106, Qingdao 266071, China.
authors.forename: Xiaowen
authors.initials: X
authors.lastname: Zhang
authors.forename: Naihao
authors.initials: N
authors.lastname: Ye
authors.forename: Shanli
authors.initials: S
authors.lastname: Mou
authors.forename: Dong
authors.initials: D
authors.lastname: Xu
authors.forename: Xiao
authors.initials: X
authors.lastname: Fan
mesh_terms: D000222:Adaptation, Physiological / Q000235:genetics*; D015870:Gene Expression; D017343:Genes, Plant; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D008027:Light; D045342:Light-Harvesting Protein Complexes / Q000235:genetics / Q000378:metabolism*; D045332:Photosystem II Protein Complex / Q000235:genetics / Q000378:metabolism*; D013312:Stress, Physiological / Q000235:genetics*; D044445:Ulva / Q000235:genetics / Q000378:metabolism* / Q000528:radiation effects; D015854:Up-Regulation; D024341:Xanthophylls / Q000378:metabolism; D065146:Zeaxanthins
chemical_list: D045342:Light-Harvesting Protein Complexes; D045332:Photosystem II Protein Complex; D024341:Xanthophylls; D065146:Zeaxanthins
keywords: A; LHCSR; NPQ; PSBS; Ulva linza; V; VDE; XC; Xanthophyll cycle; Z; antheraxanthin; non-photochemical quenching; pH-dependent quenching; qE; transthylakoid proton gradient; violaxanthin; violaxanthin de-epoxidase; xanthophyll cycle; zeaxanthin; ΔpH